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• Cassandra/HBase or just MySQL: Potential problems doing the next thing

  - by alexeypro

  Say I have "user". It's the key. And I need to keep "user count". I am planning to have record with key "user" and value "0" to "9999+ ;-)" (as many as I'll have). What problems I will drive in if I use Cassandra, HBase or MySQL for that? Say, I have thousand of new updates to this "user" key, where I need to increment the value. Am I in trouble? Locked for writes? Any other way of doing that? Why this is done -- there will be a lot of "user"-like keys. Different other cases. But the idea is the same. Why keep it this way -- because I'll have more reads, so I can always get "counted value" very fast.

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• Flot Pie Chart using Ajax, Php and MySql

  - by Neriza Almirol

  Good Day! Can you help me? I have a problem getting values from database. I want to control the legend. I've been googling the best approach for the pie chart, but still looking for the best answer for my problem. It's easy to query the data from the database, but I want to show it using the flot pie chart and I need it for statistic reports. From database, I need to get the percentage of Female and Male followers and separate it according to age groups. The data (dateOfbirth) is available from our database using facebook integration. Can you give me an example using Ajax, Php and MySql? Thank you! :) $.plot($("#graph_3"), graphData, { series: { pie: { show: true } }, grid: { hoverable: true, clickable: true } }); $("#graph_3").bind("plothover", pieHover); $("#graph_3").bind("plotclick", pieClick);

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• Syntax Error with MySql Workbench and IF Statement

  - by Hugo S.

  Hey guys, Im migrating from T-SQL to MySql syntax and don't know how to get over this syntax error given by Workbench 5.1.18: -- -------------------------------------------------------------------------------- -- Routine DDL -- -------------------------------------------------------------------------------- DELIMITER // CREATE PROCEDURE `SysTicket`.`GetProductionLines` (aId INT, aActive INT, aResponsible VARCHAR(8000)) BEGIN IF(aId > 0) THEN SELECT * FROM ProductionLine WHERE Id = @Id; ELSE IF( aActive <> -1 AND aResponsible = '|$EMPTYARG$|') THEN SELECT * FROM ProductionLine; ELSE IF(aResponsible = '|$EMPTYARG&|') THEN SELECT * FROM ProductionLine WHERE Active = aActive; ELSE SELECT * FROM ProductionLine WHERE Active = aActive AND Responsible LIKE CONCAT('%', aResponsible, '%'); END IF; END// It says Syntax error near END (last line) ty in advance.

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• PHP PDO MySQL IN (?,?,?...

  - by nute

  I want to write a MySQL statement like: SELECT * FROM someTable WHERE someId IN (value1, value2, value3, ...) The trick here is that I do not know ahead of time how many values there will be in the IN(). Obviously I know I can generate the query on the go with string manipulations, however since this will run in a loop, I was wondering if I could do it with a PDO PreparedStatement. Something like: $query = $PDO->prepare('SELECT * FROM someTable WHERE someId IN (:idList)'); $query->bindValue(':idList', implode(',', $idArray)); Is that possible?

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• MySQL differences between to select queries

  - by bpmccain

  I have two mysql queries that return a column of phone numbers. I want am trying to end up with a list of phone numbers that are in one list, but not in the other. So the two queries I have are: SELECT phone FROM civicrm_phone phone LEFT JOIN civicrm_participant participant ON phone.contact_id = participant.contact_id WHERE phone.is_primary = 1 AND participant.id IS NULL and SELECT phone FROM civicrm_phone phone LEFT JOIN civicrm_participant participant ON phone.contact_id = participant.contact_id WHERE phone.is_primary = 1 AND participant.id IS NOT NULL And before anyone asks, the above two queries do not provide mutually exclusive results (based on using IS NULL and IS NOT NULL for the last WHERE statement), since we have related individuals in the database who use the same phone number, but do not necessarily all have a participant.id. Thanks for any help.

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• PHP mySQL count number of fields not empty

  - by Pez Cuckow

  I have a database of users where they can send messages to other users (up to four) and the ID of the message they sent is in their user row. e.g. Name, Email, Msg1, Msg2, Msg3, Msg4 Pez, [email protected], 1, 55, 42, 5 //Send 4 messages Steve, [email protected], 0, 0, 0, 0 //Send 0 messages Leon, [email protected], 3, 0, 3, 5 //Send 3 messages How in a MySQL query can I get the amount of those message rows that are not empty or not equal to 0, allowing me to order by that? So it would return Pez - 4 Mesasges Leon - 3 Messages Steve - 0 Messages Im my mind something like order by count(!empty(msg1)+!empty(msg2)+!empty(msg3)+!empty(msg4)) Many thanks,

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• Let MySQL users create databases, but allow access to only their own databases

  - by eikes

  I want to have multiple a MySQL users to be able to issue commands like CREATE DATABASE dbTest; But I also want each of these users to be able to see and access only their own databases. All I could find was how to either create the databases by a DBA and grant the privileges on this database to the specific user: GRANT ALL PRIVILEGES ON dbTest.* TO 'user'; or grant privileges on all databases to a user: GRANT ALL PRIVILEGES ON *.* TO 'user'; But neither is what I want, because it needs to scale and be secure.

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• How to store data which contents the quotes in mysql

  - by Nitz

  Hey Guys, i have one problem. In one of my form i have use rich text editor from the yahoo. now i want to store the data from that text area to mysql database. bcz user can enter anything in that textarea. as example user can enter many double quotes, or single quotes. so i need to store that data which may content many double quotes or many single quotes, so how to do that? normally we store by adding that data in one variable and then put that in sql then fire. but now variable contents many quotes and now i have problem to store. i can't remove that quotes bcz of my style which is generated by rich text editor. So how can store that data without affecting my styles of data.

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• How to retrive only one cell from MySQL table with PHP

  - by JuanCee

  I'm trying to create a forgotten password form that emails users their password. I'm having a problem, though, with the actual password part. You see, I have the email and comparing the email correct, except whenever I send the email I always get either "Your password is ." or "Your password is Array". I'm using: $check_email = mysql_num_rows(mysql_query("SELECT email FROM userRecovery WHERE email = '$to'")); if($check_email == 1){ $qtip = mysql_query("SELECT password FROM userRecovery WHERE email = '$to'"); $theirPassword = mysql_fetch_array($qtip); Rest of the Code... } I used to be able to do this correctly, but I haven't done PHP or MySQL in too long so it's slightly annoying (that, and I'm at a beginner-intermediate kind of level). I remember having this exact problem, but I don't have the code with me to find out what I did. If you think I left out a detail, please say so. Any help if appreciated.

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• Subsonic 3.0 Query limit with MySQL c#.net LinQ

  - by omegawkd

  Hello, a quick question which may or may not be easily answered. Currently, in order to return a limited result set of data to my calling reference using SubSonic I use a similar function as below: _DataSet = from CatSet in t2_aspnet_shopping_item_category.All() join CatProdAssignedLink in t2_aspnet_shopping_link_categoryproduct.All() on CatSet.CategoryID equals CatProdAssignedLink.CategoryID join ProdSet in t2_aspnet_shopping_item_product.All() on CatProdAssignedLink.ProductID equals ProdSet.ProductID where ProdSet.ProductID == __ProductID orderby CatProdAssignedLink.LinkID ascending select CatSet; and select the first item from the data set. Is there a way to limit the lookup initially to a certain amount of rows? I'm using MySQL as the base database.

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• Problems upgrading MySQL application from Delphi 2006 to 2010

  - by WombaT

  I upgraded my Delphi to 2010 version and I tried to open and run application written in Delphi 2006. The app is using mysql by dbexpress with libmysql.dll and a second driver found somewhere on the Internet. I can't run it on 2010. I'm always getting "missing libmysql.dll library". I tried to get new version of it but it didn't help. Copying this library into almost all system directories didn't help. I'm out of any ideas what to do, how do I connect to database :(

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• Malformed packet error during MySQL LOAD DATA LOCAL INFILE

  - by dnagirl

  I am trying to load a file into an MySQL(v5.1.38) innodb table using PHP's mysqli::query and a LOAD DATA LOCAL INFILE query. The query returns a 'Malformed packet' error code 2027. Any ideas what is wrong? Here is the target table: CREATE TABLE `zbroom`.`lee_datareceive` ( `a` varchar(45) NOT NULL, `b` varchar(45) NOT NULL, `c` varchar(45) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1; Here is the query: LOAD DATA LOCAL INFILE '/path/to/file.txt' INTO TABLE lee_datareceive FIELDS TERMINATED BY '\t'; Here is the file data. Values are tab separated: t1 t2 t3 a b c d e f g h i

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• MYSQL Fast Insert dependent on flag from a seperate table

  - by Stuart P

  Hi all. For work I'm dealing with a large database (160 million + rows a year, 10 years of data) and have a quandary; A large percentage of the data we upload is null data and I'd like to stop it from being uploaded. The data in question is spatial in nature, so I have one table like so: idLocations (Auto-increment int, PK) X (float) Y (foat) Alwaysignore (Bool) Which is used as a reference in a second table like so: idLocations (Int, PK, "FK") idDates (Int, PK, "FK") DATA1 (float) DATA2 (float) ... DATA7 (float) So, Ideally I'd like to find a method where I can do something like: INSERT INTO tblData(idLocations, idDates, DATA1, ..., DATA7) VALUES (...), ..., (...) WHERE VALUES(idLocations) NOT LIKE (SELECT FROM tblLocation WHERE alwaysignore=TRUE ON DUPLICATE KEY UPDATE DATA1=VALUES(DATA1) So, for my large batch of input data (250 values in a block), ignore the inserts where the idLocations matches an idLocations values flagged with alwaysignore. Anyone have any suggestions? Cheers. -Stuart Other details: Running MySQL on a semi-dedicated machine, MyISAM engine for the tables.

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• How do I prevent duplicate entrys to mySQL?

  - by ggfan

  On my site, I have a form that users fill out to become a member. They fill out name, bday, email, etc. Then when they click submit, the data gets into mySQL. But sometimes when a user clicks submit many times or refreshes the page, the data gets inputted to the database more than once. How can I prevent this? Is there a code I can use to only let one set of data get into the database? This is also a problem in my comment section. I allow uses to put comments on people's profiles. But when they abuse the refresh button or submit button, I get like 10 of the same comments. Thanks.

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• Generating a text file in MYSQL stored procedure

  - by Pablo

  Hi, I'm new to MySQL, I am trying to create a text file using a stored procedure. I'm currently at the stage where I have a temporary table that contains all of the records that I want to output to a text file. I have the following line at the end of my SP, it works in PHPMYAdmin's query but it does not work when part of a stored procedure the code is as follows: SELECT * into outfile '../../htdocs/VIP/Temp/temp.txt' from tmp_Menu2; note that tmp_Menu2 is a table that only includes one field of type VARCHAR(1000) Any help would be greathly appreciated. Thank you,

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• Convert a Mysql database from latin to UTF-8

  - by Matthieu

  I am converting a website from ISO to UTF-8, so I need to convert the Mysql database too. On internet, I read various solutions, I don't know wich one to choose. Do I really need to convert my varchar columns to binary, then to utf8 like that : ALTER TABLE t MODIFY col BINARY(150); ALTER TABLE t MODIFY col CHAR(150) CHARACTER SET utf8; This is long to do that for each column, of each table, of each database. I have 10 database, wich 20 tables each, wich around 2 - 3 varchar colums (2 queries each column), this gives me around 1000 queries to write ! How come ? How to do ?

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• MySQL index cardinality - performance vs storage efficiency

  - by Sean

  Say you have a MySQL 5.0 MyISAM table with 100 million rows, with one index (other than primary key) on two integer columns. From my admittedly poor understanding of B-tree structure, I believe that a lower cardinality means the storage efficiency of the index is better, because there are less parent nodes. Whereas a higher cardinality means less efficient storage, but faster read performance, because it has to navigate through less branches to get to whatever data it is looking for to narrow down the rows for the query. (Note - by "low" vs "high", I don't mean e.g. 1 million vs 99 million for a 100 million row table. I mean more like 90 million vs 95 million) Is my understanding correct? Related question - How does cardinality affect write performance?

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• How to kill mysql process through C#.

  - by deepesh khatri

  I am getting "too many connections" problem in an Asp .Net Mvc application which get fix when i manually kill process through Mysql v6.56 IDE, But on remote hosting computer where i can't kill process each time how can i fix this error. I have tried making a connection to information_schema DB's PROCESSLIST table but when connection is about to execute command there comes an error "access denied of root@loclahostto information_schema". I also have tried to grant all privileges to root@loclahost but still i am not able to fix this problem. I have been coding the same way from last two years but in this application i am getting this problem i have use close each connection in every method. Please if some one have ever got this problem or know the answer.Please help me. Thanx in advance

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• complex mysql rank !

  - by silversky

  I have a tb with this col: ein, los, id ... I whant to order the table by this index: win / ( win + los ) * 30 + win / SUM(win) * 70 and then to find the rank for two id's. I'm not very good on mysql, so whath I wrote it's totally wrong: $stmt=$con-prepare("SET @rk := 0"); $stmt=$con-prepare("SELECT rank, id FROM ( SELECT @rk := @rk + 1 AS rank, (win/(win+los)*30+win/SUM(win)*70) AS index, win, los, id FROM tb_name ORDER BY index DESC) as result WHERE id=? AND id=?"); $stmt - bind_param ("ii", $id1, $id2); $stmt - execute(); $stmt - bind_result($rk, $idRk); And also this query it supouse to run maybe every 5-10 sec for every user, so I'm trying to find something very, very fast. if it's necesary I could add, change, delete any column, in order to be as faster as posible.

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• Django/MySQL - __istartswith not producing case-insensitive query.

  - by TheLizardKing

  I make use of generic views and I am attempting to query my MySQL db (utf8_bin collation) in a case insensitive manor to try to find all my song titles that start with a particular letter. view.py def tracks_by_title(request, starts_with): return object_list( request, queryset = Track.objects.filter(title__istartswith=starts_with), template_name = 'tlkmusic_base/titles_list.html', template_object_name = 'tracks', paginate_by = 25, ) and my urls.py urlpatterns = patterns('tlkmusic.apps.tlkmusic_base.views', (r'^titles/(?P<starts_with>\w)/$', tracks_by_title), ) the query it produces according to the django debug toolbar is: SELECT `tracks`.`id`, `tracks`.`url`, `tracks`.`artist`, `tracks`.`album`, `tracks`.`genre`, `tracks`.`year`, `tracks`.`title`, `tracks`.`comment`, `tracks`.`tracknumber`, `tracks`.`discnumber`, `tracks`.`bitrate`, `tracks`.`length`, `tracks`.`samplerate`, `tracks`.`filesize`, `tracks`.`createdate`, `tracks`.`modifydate` FROM `tracks` WHERE `tracks`.`title` LIKE a% LIMIT 1 specifically this line: WHERE `tracks`.`title` LIKE a% LIMIT 1 Why is it not ILIKE which is what I was expecting by using __istartswith? I am using Django 1.1.1 on Ubuntu.

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• mysql, sqlite database source code

  - by Yang

  hi guys, i know implementing database is a huge topic, but i want to have a basic understanding of how database systems works (e.g. memory management, binary tree, transaction, sql parsing, multi-threading, partitions, etc) by investigating the source code of the database, since there are a few already proven very robust open source databases like mysql, sqlite and so on. however, the code are very complicated and i have no clue where to start. also i find that the old school database textbooks are only explaining the theory, not the implementation details. Can anyone suggest how should i get started and is there any books that emphasis on the technology and techniques of building dbms used in modern database industry? Thank in advance!

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• mysql index optimization for a table with multiple indexes that index some of the same columns

  - by Sean

  I have a table that stores some basic data about visitor sessions on third party web sites. This is its structure: id, site_id, unixtime, unixtime_last, ip_address, uid There are four indexes: id, site_id/unixtime, site_id/ip_address, and site_id/uid There are many different types of ways that we query this table, and all of them are specific to the site_id. The index with unixtime is used to display the list of visitors for a given date or time range. The other two are used to find all visits from an IP address or a "uid" (a unique cookie value created for each visitor), as well as determining if this is a new visitor or a returning visitor. Obviously storing site_id inside 3 indexes is inefficient for both write speed and storage, but I see no way around it, since I need to be able to quickly query this data for a given specific site_id. Any ideas on making this more efficient? I don't really understand B-trees besides some very basic stuff, but it's more efficient to have the left-most column of an index be the one with the least variance - correct? Because I considered having the site_id being the second column of the index for both ip_address and uid but I think that would make the index less efficient since the IP and UID are going to vary more than the site ID will, because we only have about 8000 unique sites per database server, but millions of unique visitors across all ~8000 sites on a daily basis. I've also considered removing site_id from the IP and UID indexes completely, since the chances of the same visitor going to multiple sites that share the same database server are quite small, but in cases where this does happen, I fear it could be quite slow to determine if this is a new visitor to this site_id or not. The query would be something like: select id from sessions where uid = 'value' and site_id = 123 limit 1 ... so if this visitor had visited this site before, it would only need to find one row with this site_id before it stopped. This wouldn't be super fast necessarily, but acceptably fast. But say we have a site that gets 500,000 visitors a day, and a particular visitor loves this site and goes there 10 times a day. Now they happen to hit another site on the same database server for the first time. The above query could take quite a long time to search through all of the potentially thousands of rows for this UID, scattered all over the disk, since it wouldn't be finding one for this site ID. Any insight on making this as efficient as possible would be appreciated :) Update - this is a MyISAM table with MySQL 5.0. My concerns are both with performance as well as storage space. This table is both read and write heavy. If I had to choose between performance and storage, my biggest concern is performance - but both are important. We use memcached heavily in all areas of our service, but that's not an excuse to not care about the database design. I want the database to be as efficient as possible.

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• Find and replace string in MySQL using data from another table

  - by Charlie

  Hi, sorry for formatting this wonky but hope you can understand it. I have two MySql tables, and I want to find and replace text strings in one using data in another. Texts - one column: messages 'thx guys' 'i think u r great' 'thx again' ' u rock' Dictionary - two columns: bad_spelling, good_spelling 'thx' 'thanks' ' u ' ' you ' ' r ' ' are ' I want SQL to go through and look at every row in messages and replace every instance of bad_spelling with good_spelling, and to do this for all the pairs of bad_spelling and good_spelling The closest I have gotten is this: update texts, dictionary set texts.message = replace(texts.message, dictionary.bad_spelling, dictionary.good_spelling) But this only changes 'thx' to 'thanks' (in 2 rows) and does not go on to replace ' u ' with ' you' or ' r ' with ' are '. Any ideas how to make it use all the rows in dictionary in the replace statement? -- PS forgot to mention that this is a small example and in the real thing I will have a lot of find/replace pairs, which may get added to over time.

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• newbie: how to upload images from a form with PHP and mySQL

  - by paracaudex

  I'm creating a web app (locally, so security doesn't matter) in PHP where the user uploads a set of information and a small .jpeg, which is then inserted into a mySQL table. I can do this no problem with all the text data, but I'm not sure how to cause the image to upload alongside it. I assume I will have to use the blob data type and input type="file", but I fooled around with that a little bit and the solution doesn't seem to be an intuitive extension of how input type="text" works. Do I need to do a lot more PHP scripting to get this to work? Is it possible to upload an image with a form, or is there a necessary intermediate step?

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• Views performance in MySQL for denormalization

  - by Gianluca Bargelli

  I am currently writing my truly first PHP Application and i would like to know how to project/design/implement MySQL Views properly; In my particular case User data is spread across several tables (as a consequence of Database Normalization) and i was thinking to use a View to group data into one large table: CREATE VIEW `Users_Merged` ( name, surname, email, phone, role ) AS ( SELECT name, surname, email, phone, 'Customer' FROM `Customer` ) UNION ( SELECT name, surname, email, tel, 'Admin' FROM `Administrator` ) UNION ( SELECT name, surname, email, tel, 'Manager' FROM `manager` ); This way i can use the View's data from the PHP app easily but i don't really know how much this can affect performance. For example: SELECT * from `Users_Merged` WHERE role = 'Admin'; Is the right way to filter view's data or should i filter BEFORE creating the view itself? (I need this to have a list of users and the functionality to filter them by role). EDIT Specifically what i'm trying to obtain is Denormalization of three tables into one. Is my solution correct? See Denormalization on wikipedia

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